Multi-branched carbazole derivatives for two-photon absorption and two-photon excited fluorescence  

多分枝咔唑衍生物的双光子吸收和双光子荧光性质(英文)

作　　者：钱鹰[1] 黄维[2] 路志锋[1] 孟康[1] 吕昌贵[2] 崔一平[2] 

机构地区：[1]东南大学化学化工学院,南京211189 [2]东南大学电子科学与工程学院,南京210096

出　　处：《Journal of Southeast University(English Edition)》2008年第2期234-237,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.60678042);the Natural Science Foundation of Jiangsu Province(No.BK2006553);the Pre-Research Project of the National Natural Science Foundation supported by Southeast University(No.9207041399)

摘　　要：Carbazole-core multi-branched chromophores 9-ethyl- 3, 6-bis （ 2- { 4- [ 5- （4-tert-butyl-phenyl） - [ 1, 3, 4 ] oxadiazol-2-yl ] - phenyl }-vinyl） -carbazole（3） and 9-ethyl-3-（ 2- {4-[ 5-（4-tert-butyl- phenyl） -[ 1, 3, 4 ] oxadiazol-2-yl ] -phenyl }-vinyl ） -carbazole （ 2 ） are synthesized through Wittig reaction and characterized by nuclear magnetic resonance（NMR）and infrared（IR）. The two- photon absorption properties of chromophores are investigated. These chromophores exhibit large two-photon absorption crosssections and strong blue two-photon excited fluorescence. The cooperative enhancement of two-photon absorption（TPA） in the multi-branched structures is observed. This enhancement is partly attributed to the electronic coupling between the branches. The electronic push-pull structures in the arm and their cooperative effects help the extended charge transfer for TPA.通过Wittig反应合成了咔唑衍生物9-乙基-3-{5-(4-叔丁基苯基)-[1,3,4]二唑-2-苯乙烯基}-咔唑(2)和9-乙基-3,6-双{5-(4-叔丁基苯基)-[1,3,4]噁二唑-2-苯乙烯基}-咔唑(3),用核磁共振和红外光谱进行了结构表征.实验测定了咔唑衍生物的双光子吸收和双光子诱导荧光性质.这些化合物的双光子吸收截面较大,在800nm波长的激光激发下发出很强的蓝色双光子上转换荧光.实验中观察到了多枝结构在双光子吸收中的协同效应.这样的协同效应部分原因是由于多分枝间电子耦合作用,多分枝分子中重复单元的推拉电子结构和协同效应有效地增强了分子的双光子吸收性质.

关 键 词：two-photon absorption two-photon excited fluorescence multi-branched chromophores carbazole derivatives 

分 类 号：O626.24[理学—有机化学]